and then at some point during this fire fight the older brother, tamerlan, throws a giant device, a bag, a satchel which apparently we are told contains another one of these pressure cooker bombs just like in the boston marathon and that explodes. but it doesn't explode in the way it's intended. the top comes off when he throws it so the explosive doesn't have the pressure built up that it would be if it was airtight and that's probably the only reason that more police officers weren't killed or maimed or injured there. but he dies in a a hail of bullets and that explosion. in the confusion-- and this may have been part of the plan, i'll rush the police, throw the bomb, you get away-- his brother jumps back in the carjacked vehicle and speeds off, actually backing over his older brother's body in the getaway. goes about five blocks, jumps out of the car. they have set up a perimeter in that area already and they start to tighten up that perimeter thinking if we've got him boxed in we'll search house to house. but many hours later they still haven't found him. >> rose: the man whose car